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In the Forum: Horn-Loaded Speakers
In the Thread: Practical Guide for Back Chambers Tuning.
Post Subject: Back chamber tuning QAPosted by Romy the Cat on: 12/3/2007
It is really a seldom thing in audio – when people ask questions afar they do own homework and demonstrate understating and own thinking on the subject.
Question: Whan bass horn back chamber tuning should be started?
1) Set up back chamber volume and then found a right high-pass filter
2) Set high-pass filter and then found a right volume of back chamber
I think the filter and volume of back chamber are interconnected.
Answer: I usually disregard high-pass cap and tune the back chamber. When I get right sound then I measure the lower knee response at 12-24 measurements per octave and apply a cap then the filter just begins to affect response. Then I add ~5% of capacitance to the found cap, assuring that the cap will NOT truncate the horn response. Usually it is approximately 1/2 octave of the horn's rate. Then I listen the horn with and without the cap. Sonically it is usually no contest. Interesting that the quality of the cap is also quite influential. My experimented concluded that pair of regular Nichicon electrolytic with active biasing were absolutely the best.
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